Customer rights group Which” said thousands of websites could be flouting regulations covering distance selling – such as the time frame allowed for goods to be returned.
Even big retailers such as Marks and Spencer and Game were pulled up by the group and have since altered the wording of their websites. According to the BBC, however, both deny breaking the law.
"If you are an online store, it is your duty to stick with the legislation," said Matt Bath, the technology editor of Which?.
Andrew McClelland of the Internet Media in Retail Group added: "A lot of retailers new to the business, whilst not deliberately wanting to break the law, probably don’t understand the requirements of the legislation."